x = int(input())
print("Yes") if x >= 30 else print("No") x = int(input()) x int(input()) int input() input print("Yes") if x >= 30 else print("No") x >= 30 x 30 print("Yes") print "Yes" print("No") print "No" x = int(input()) int(input()) x
x = int(input())
print("Yes") if x >= 30 else print("No")